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International Journal of Wildland Fire International Journal of Wildland Fire Society
Journal of the International Association of Wildland Fire
RESEARCH ARTICLE

Influence of wildfire severity on geomorphic features and riparian vegetation of forested streams of the Sierra Nevada, California, USA

Breeanne K. Jackson https://orcid.org/0000-0002-7398-4130 A B C and S. Mažeika P. Sullivan https://orcid.org/0000-0003-2341-5316 A
+ Author Affiliations
- Author Affiliations

A Shiermeier Olentangy River Wetland Research Park, School of Environment and Natural Resources, The Ohio State University, Columbus, OH 43202, USA.

B Present address: Resources Management and Science Division, Yosemite National Park, 5083 Foresta Road, El Portal, CA 95318, USA.

C Corresponding author. Email: breeannekjackson@gmail.com

International Journal of Wildland Fire 29(7) 611-617 https://doi.org/10.1071/WF19114
Submitted: 1 August 2019  Accepted: 7 February 2020   Published: 31 March 2020

Abstract

Fires are a common feature of many landscapes, with numerous and complex ecological consequences. In stream ecosystems, fire can strongly influence fluvial geomorphic characteristics and riparian vegetation, which are structural components of stream–riparian ecosystems that contribute to biodiversity and ecosystem function. However, the effects of fire severity on stream–riparian ecosystems in California’s Sierra Nevada region (USA) are not well described, yet critical for effectively informing fire management and policy. At 12 stream reaches paired by fire severity (one high-severity burned, one low-severity burned), no significant differences were found in riparian plant community cover and composition or stream geomorphic characteristics 2–15 years following wildfire. In addition, minimal changes in riparian vegetation and stream geomorphic properties were observed in the first summer following the extensive and severe Rim Fire. However, an upstream-to-downstream influence of multiple fire occurrences was observed over the previous 81 years within each catchment on stream geomorphic metrics, including sediment size, embeddedness and channel geometry, at our study reaches. The inconsistent effects of wildfire on stream–riparian vegetation and geomorphic characteristics over space and time may be related to time since fire and precipitation.

Additional keywords: channel geometry, fire extent, fire severity, Rim Fire, riparian vegetation, Yosemite.


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